COL1A1 and idiopathic pulmonary fibrosis: TKS5 mRNA expression in the lung tissue, of both humans and mice, correlated with the mRNA expression of COL1A1, a hallmark of deregulated expression in IPF, while TKS5 expression in fibrotic lungs was predominantly localized in the alveolar epithelium and COL1A1-expressing LFs (Fig. 1 and Supplementary Figs. 1-3), pending larger scale immunohistochemical studies.